Not easy, but it's the law.

1. The force of attraction between all masses in the universe; especially, the attraction of the earth's mass for bodies near its surface.
2. The natural force of attraction exerted by a celestial body; such as, the earth, upon terrestrial objects at or near its surface, tending to draw them toward the center of its body.
3. The seriousness or importance of something or the seriousness of anything considered in terms of its unfavorable consequences.